16 Dec 2005 frob   » (Journeyer)

My friend is looking for Information Security related job in the Toronto area.
It's a resume in pdf

"GnomeMeeting VTA"
I collected and analysed additional data about Cisco VTA and 'CAST' (as ethereal dissect it) protocol.

What is 'Advantage' (as the 'A' in a 'CVTA') means?

    If one has already installed Cisco IP telephony, then it can be easy and 'chiply' extended with videotelephony capabilities. The extension includes slightly modified Logitech webcam (cisco logo, different usb id, possibly some other code in the cam firmware) and some software. This 'bundle' is about twice+ in price of the same regular Logitech webcam. Software is win32-only.
    To install you need attach webcam to usb-port on your computer and switch on video for your IP-phone (7940 and more powerfull models) in the CCM (CallManager -- Cisco IP PBX) configuration. When somebody with videophone capabilities calls you by IP phone, CVTA-client brings up and setup videocall. So you are looking on screen and speak/listen with phone handset/handsfree.

Technical side.

    CVTA client uses CDP (cisco discovery protocol) to learn IP-address of IP phone your computer connected to. CVTA client setups TCP connection to phone and uses 'CAST' to exchange information about line/call state. As part of this information CVTA receives IP-address of calling party and setups videocall (H.323, RTCP + RTP).

The idea is to add something (support of CAST?) to GnomeMeeting and replace CVTA with GM. I'm trying to read some unix network programming books at present ;-)


  • "GM advantage" would be able to work with about any webcam
  • "GM advantage" would be able to work on OSes supported by GM

    So there is some 'market' to share ;-) Additionaly such a plug-in (which extract info about calling party phone number/name) can be used as the base for CTI extensions (for example, bring up an evolution window with last e-mail received/sent to calling person).

    About a month after examination I received my JNCIS-M certificate.

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